The girl group will headline a third night at the O2 Arena on March 3 after demand for their London dates surpassed expectations.
"Wow, you guys are amazing. We've had to add a third London date. Cannot wait to get out on the road," the band tweeted.
Girls Aloud will embark on a headline tour of the UK in 2013 to celebrate their 10th anniversary.
The string of shows are in support of their upcoming retrospective collection Ten, which will be released on November 26.
The set will be preceded by new single 'Something New' on November 18 and Girls Aloud have confirmed that a second new single will also be lifted from the album.
Watch the music video for Girls Aloud's new single 'Something New' below: